Expandable chuck



Feb. 28, 1967 L H. EWING EXPANDABLE CHUCK ZSheesf-Sheet 2 I Filed Jan. 6, 1965 @www OW dm.

United States Patent C) My invention relates to a new and useful improvement in an expandable chuck and more particularly to an expandable chuck used in association with hollow core paper rolls for rotatably supporting such rolls on a shaft or the like.

Another object of my invention is in the provision, in a device of this character, of a means for radially expanding the chuck evenly within a paper roll core.

Another object of my invention is in the provision in a device of this character, of a means for expanding a chuck so that it may be easily and conveniently used in paper roll cores of varying diameter.

A further object of my invention is to provide, in a device of this character, a simple and yet effective means for securing the chuck to a paper roll supporting shaft and to expand said chuck radially of the shaft into a positive contact with the inner diameter of the core so as to achieve a positive driving connection between the supporting shaft and the paper roll core.

Other objects will appear hereinafter.

The invention consists in the novel combination and arrangement of parts to be hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings showing the preferred form of construction, and in which:

FIG. 1 is a fragmentary perspective view of my improved expandable chuck mounted on a paper roll supporting shaft,

FIG. 2 is a detailed sectional view taken on line 2 2 of FIG. 1,

FIG. 3 is a fragmentary perspective view of a modified form of an expansion sleeve associated with my expandable chuck,

FIG. 4 is a fragmentary perspective view of a modified form of my expandable chuck mounted on stub shafts, and

FIG. 5 is a detailed sectional view taken on line 5 5 of FIG. 4.

In the paper and printing industries, large paper rolls are generally formed by winding the paper on tubular cores or the like which are formed of paper, wood or metal. These cores are susceptible to being mounted on suitable chucks carried by a supporting shaft which shaft in turn is mounted on a suitable machine. The supporting sha-ft is generally mounted on such a machine by means of suitable bushings and in many instances is drivingly connected to a power drive mechanism of the machines so as to afford a positive drive for the paper roll. Because of this driving connection, Yit is required that the chuck upon which the core is mounted must have positive gripping action between the core and the shaft. The supporting shaft normally extends through the center of the core and it is desirable that they be centered within the core to prevent the roll of paper from vibrating at high rotary speeds.

The present invention is directed to the accomplishment of the above objects and as such is exemplified by a pair of expandable chucks indicated generally as at in FIG. l. These chucks are mounted on a supporting shaft 11 and are adapted to extend into opposite ends of the core of a paper roll.

While a pair -of chucks are used, one at each end of the paper roll core, only one will be described and it is to be understood that the other is to be of the same identical construction. 1

3,306,550 Patented Feb. 28, 1967 The chuck 10 includes an elongated expansion sleeve 12 through which the supporting shaft 11 is projected. This expansion sleeve 12 terminates at one end into an enlarged circular bearing head 13. This bearing head 13 is provided with a circular recess 14 formed in the one face thereof opposite to the expansion sleeve 12 as seen in FIG. 2. This recess has its wall 15 inclined inwardly in the direction of the sleeve 12. The expansion sleeve 12 is divided into equal sections by a plurality of slots 16 extending longitudinally of the sleeve 12 starting at the base of the bearing head 13 and terminating short of the inner end of the sleeve 12. Iournaled on the shaft 11 is a lock-up bearing 17 which includes a laterally extending externally threaded tubular portion 18. This tubular portion 18 is insertable into the recess 14 of the enlarged bearing head 13 formed at one end of the expansion sleeve 12 as seen in FIG. 2.

This lock-up bearing 17 is provided with an enlarged split collar 19. Each portion of the split collar 19 is provided with an aligned aperture 20 through which is projected a clamping bolt 21. This clamping bolt 21 securely connects the split collar 19 and bearing 17 to the shaft 11. Threaded upon the portion 18 of the bearing 17 is a thrust nut 22. This .thrust nut 22 includes a` circular base 24 and a reduced neck 23 extending therefrom in the direction of the circular recess 14 yformed in the one face of the enlarged bearing head 13. This reduced neck 23 terminates into an enlarged circular insert ring 23 which has its periphery tapered as at 24 in a manner to correspond to the inclined wall surface 15 of the recess 14 so that these two surfaces may lie in facial abutment as seen in FIG. 2.

Circumferentially formed in the tapered surface 15 of the enlarged head 13 and having open communication with the recess 14 is a groove 25. Adapted to be disposed in the groove 25 is a split ring collar 26. This split ring collar freely encircles the neck 23 between the base 24 and the insert ring 23 and functions to prevent lateral separation of the thrust nut 22 and the expansion sleeve 12 by engaging opposite shoulders 27 provided by the insert ring 23 and the base 24 as seen in FIG. 2. By this arrangement, the split ring collar 26 prevents separation of the expansion sleeve 12 from the thrust nut 22 while permitting free rotational movement of one relative to the other.

In operation, one of the chucks 10 is mounted upon the supporting shaft 11 and the shaft 11, together with the expansion sleeve 12 of the chuck 10 is inserted into the hollow core yof the paper roll. The associated chuck 10 is then journaled on the shaft 11 in a manner so that its expandable sleeve 12 extends in confronting relation to theI expandable sleeve of the other chuck and is inserted into the opposite end of the hollow core of the paper roll.

Eac-h of the lock-up bearings 17 through the clamping bolts 22 are then secured to the shaft 11. With a Spanner wrench the thrust nut 22 are threaded over the threaded tubular portion 18 of the lock-up bearing 17 so that the tapered surface 24 of the insert ring 23 engage the inclined surface 15 .of the enlarged bearing head 13 causing radial expansion of each part of the expansion sleeve 12 formed by the slots 16. This radial expansion results in a positive co-nnection with the inner surface of the hollow core 28 of the paper roll.

When the chucks 10 are used with a metal core, I provide locking pins 29 carried by the inner face of the enlarged head 13 of the expansion sleeve 12. These pins 29 extend in parallel direction with respect to the expansion eral surface a series of serrations 31. These serrations 31 are tapered outwardly of the axial plane of the sleeve 30 in the direction of the enlarged head 32 of the expansion sleeve 30. This modified expansion sleeve 30 is to be used on paper roll cores made from paper or wood or the like.

Referring to FIGS. 4 and 5, I disclose a modified form of an expandable chuck. This modified form of chuck is indicated as at 33 and is shown mounted upon stub shafts 34. The modified chuck 33 includes an expansion sleeve 35 terminating at one end into an enlarged bearing head 36. The Ihead 36 and part of the sleeve 35 are divided into equal segments by longitudinal slots 37 The enlarged bearing head is provided with a central recess 38 formed in the one face thereof with the wall 39 of the recess 38 tapered downwardly and inwardly in the direction of the sleeve 35.

Adapted to be associated with the chuck 33 is an expanding member 40. This expanding member 40 includes an enlarged circular base 41 which has a central opening 42 formed therein through which the stub shaft 34 is projected. The base 41 is provided with an enlarged circular recess 43 which has open communication with the central opening 42 adjacent one face of the base 41 as seen in FIG. 5. Adapted to sit in the recess 43 is a split ring 44 which encircles stub shaft 34. A plurality of set screws 45 are adapted to be threaded through suitable threaded openings 46 formed in the base 41 into frictional engagement with the split ring 44 so as to secure the member 40 to the stub shaft 34.

The member 40 is provided with a reduced neck 47 which extends laterally from one face of the base 41 in the direction of the sleeve 35. This reduced neck 47 terminates into an enlarged circular insert ring 48. This insert ring 48 has its periphery tapered as at 49 in a manner to correspond to the inclined wall 39 of the recess 38 formed in the bearing head 36 so that the two surfaces may lie in facial abutment as seen in FIG. when the insert ring 48 is projected into the recess 38.

Circumferentially formed in the tapered wall 39 of the recess 38 and having open communication therewith, is a groove 50. Inserted in the groove 50 is a locking spring collar 51 which freely encircles the neck 47 of the member 40 between the base 41 and the insert ring 48. This locking spring collar 51 functions to permit limited lateral movement of the member 40 with respect to the bearing head 36. Tlhe locking spring collar 51 will engage a shoulder 52 provided by the insert ring 48 so as to prevent complete separation of the member 40 with respect to the bearing head 36 of the chuck 33.

To prevent rotational movement between the member 40 and the chuck 33, I provide stop pins 53, which pins 53 project laterally from the insert ring 48y and have their free ends located in one of the slots 37 as seen in FIGS. 4 and 5. As the member 40 is moved coaxially with respect to the chuck 33, these pins 53 will freely move through the slot 37.

In operation the chucks 33 are mounted on oppositely extending stub shafts 34 with the expansion sleeves 35 of each chuck extending in confronting relation with respect to each other as seen in FIG. 4. The stub shafts 34, together with the chucks 33, are inserted into opposite ends of the paper roll core 54. The expanding members 40 are mechanically or hydraulically forced into the opposite ends of the core 54. This axial movement will cause the insert ring 48 to engage the wall 39 of the recess 38 of the bearing head 36 and by reason of the configuration thereof will evenly expand each of the segments .of the head 36 and sleeve 35. This expansion will provide a positive connection between the stub shafts 34, chucks 33, and the hollow core 54 of the paper roll.

While I have illustrated and described the preferred form of construction for carrying my invention into effect,

this is capable of variation and modification without departing from the spirit of the invention. I therefore do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the score of the appended claims.

Having thus described my invention, what I claim as new and desire to protect by Letters Patent is:

1. A chuck for securing a hollow core paper lroll on a shaft comprising in combination,

(a) an expansion sleeve journaled upon said shaft with one end freely insertable in said hollow core paper roll and the opposite end providing an enlarged hollow head externally of the hollow core of the paper roll, said enlarged head having an inner tapered surface,

(b) a lock-up member journaled on said shaft axially from said expansion sleeve and providing an externally threaded tubular portion extending in the direction of said core and into the enlarged hollow head of said expansion sleeve,

(c) means for securing said lock-up member to said shaft,

(d) an expanding means threadably mounted on said tubular portion of said lock-up member and movable thereover axially of said shaft and inward of said enlarged hollow head of said sleeve,

(e) said expanding means having an outer tapered surface movable into facial abutment with said like inner tapered surface provided by said enlarged hollow head 0f said sleeve for radially expanding said enlarged hollow head and said sleeve within said core to frictionally secure said chuck to said core when said expanding means is moved axially of said shaft and inwardly of said sleeve.

2. A chuck as defined by claim 1 including means connecting said expanding means to said enlarged hollow head for preventing complete separation therebetween while permitting limited axial and radial movement of said expanding means.

3. A chuck as defined by claim 1 further including an externally threaded tubular portion provided byV said lockup member extending in the direction of said core and into the enlarged hollow head of said expansion sleeve.

4. A chuck as defined by claim 1 further including a split ring carried within said enlarged hollow head of said sleeve encircling a portion of said expanding means and having a reduced circumference for preventing complete separation of said enlarged hollow head and said expanding means while permitting axial and radial movement thereof.

5. A chuck as defined by claim 1 wherein said lock-up member provides a split collar clamp for securing said lock-up member in a fixed position on said shaft.

6. A chuck as defined by claim 1 wherein said expansion sleeve has formed therein a plurality of slots extending from the inner end of said sleeve partially throughout the longitudinal length thereof and dividing said sleeve into substantially equal segments.

References Cited bythe Examiner UNITED STATES PATENTS 2,697,563 12/1954 Miller 242-682 2,733,873 2/ 1956 Petersen 242-72.1 2,904,279 9/ 1959 Ewing 242-721 3,157,405 11/ 1964 Hafemeister 242-68.?. X

FOREIGN PATENTS 853,905 10/1952 Germany.

FRANK I. COHEN, Primary Examiner.

MERVIN STEIN, Examiner.

N. L. MINTZ, Assistant Examiner. 

1. A CHUCK FOR SECURING A HOLLOW CORE PAPER ROLL ON A SHAFT COMPRISING IN COMBINATION, (A) AN EXPANSION SLEEVE JOURNALED UPON SAID SHAFT WITH ONE END FREELY INSERTABLE IN SAID HOLLOW CORE PAPER ROLL AND THE OPPOSITE END PROVIDING AN ENLARGED HOLLOW HEAD EXTERNALLY OF THE HOLLOW CORE OF THE PAPER ROLL, SAID ENLARGED HEAD HAVING AN INNER TAPERED SURFACE, (B) A LOCK-UP MEMBER JOURNALED ON SAID SHAFT AXIALLY FROM SAID EXPANSION SLEEVE AND PROVIDING AN EXTERNALLY THREADED TUBULAR PORTION EXTENDING IN THE DIRECTION OF SAID CORE AND INTO THE ENLARGED HOLLOW HEAD OF SAID EXPANSION SLEEVE, (C) MEANS FOR SECURING SAID LOCK-UP MEMBER TO SAID SHAFT, (D) AN EXPANDING MEANS THREADABLY MOUNTED ON SAID TUBULAR PORTION OF SAID LOCK-UP MEMBER AND MOVABLE THEREOVER AXIALLY OF SAID SHAFT AND INWARD OF SAID ENLARGED HOLLOW HEAD OF SAID SLEEVE, (E) SAID EXPANDING MEANS HAVING AN OUTER TAPERED SURFACE MOVABLE INTO FACIAL ABUTMENT WITH SAID LIKE INNER TAPERED SURFACE PROVIDED BY SAID ENLARGED HOLLOW HEAD OF SAID SLEEVE FOR RADIALLY EXPANDING SAID ENLARGED HOLLOW HEAD AND SAID SLEEVE WITHIN SAID CORE TO FRICTIONALLY SECURE SAID CHUCK TO SAID CORE WHEN SAID EXPANDING MEANS IS MOVED AXIALLY OF SAID SHAFT AND INWARDLY OF SAID SLEEVE. 